You can be confident that you are only purchasing GENUINE Viessmann spare parts for the maintenance and boiler repair of your Viessmann Heating Boiler since we only sell GENUINE Viessmann boiler spare parts that are in accordance with the safety and performance specifications of your heating appliance. Important Note: Products cannot be returned, exchanged or refunded where the security seal/tag is broken, tampered with, or compromised (such as PCB’s, electronic goods, fans). See our Refunds and Returns Policy for further information.